Method of preparing 1,1,1,2-tetrafluoroethane from 1,1-dichloro-

Details Method of preparing 1,1,1,2-tetrafluoroethane from 1,1-dichloro- Method of preparing 1,1,1,2-tetrafluoroethane from 1,1-dichloro-

1989-05-26

1991-02-26

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570151, 570166, 570169, C07C 1710, C07C 1908, C07C 1708

Patent

active

049963791

ABSTRACT:
1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), with hydrogen gas in the presence of a palladium-on-active alumina catalyst at a temperature lower than 200.degree. C. and not lower than 120.degree. C. R-114a almost free of R-114 is obtained by reacting 1,1,1-trichloro-2,2,2-trifluoroethane with hydrogen fluoride in vapor phase in the presence of a catalyst prepared by partially fluorinating .gamma.-alumina by treatment with hydrogen fluoride gas.

REFERENCES:
patent: 2748177 (1956-05-01), Miller et al.
patent: 3087974 (1963-04-01), Hauptschein et al.
patent: 3650987 (1972-03-01), Vecchio et al.
"Studies on a Vapour-Phase for the Manufacture of Chlorofluoroethanes", by M. Vecchio et al., Journal of Fluorine Chemistry, 4 (1974), pp. 117-139.
"Catalyst for Fluorination of Organic Chlorocompounds", by L. Marangoni et al., Chim. Ind. (Milan), 64, pp. 135-139 (1982).

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